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projection

theory In domain theory, a function, f, which is (a)

idempotent, i.e. f(f(x))=f(x) and (b) whose result is no

more defined than its argument. E.g. F(x)=bottom or F(x)=x.

In reduction systems, a function which returns some

component of its argument. E.g. head, tail, (x,y) . x.

In a graph reduction system the function can just return a

pointer to part of its argument and does not need to build any

new graph.